package com.bobi.tfca.utils;

import java.security.MessageDigest;
import java.util.Random;

/**
 * 该类主要负责给密码进行加盐混淆和MD5加密操作
 */
public class MD5Util {
    /** MD5 */
    private static final String hexDigIts[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    private static final String salts[] = {"A","B","C","D","E","H","Z","G","0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f","$","#","*","@"} ;

    /**
    *@Date: 2023/7/23  16:42
    *@Author: duan
    *创造出一个六位长度的盐
    */
    public static String getSalt() {
        StringBuilder sc = new StringBuilder();
        for (int i = 0; i < 6; i++) {
            Random random = new Random() ;
            int index = random.nextInt(28) ;
            sc.append(salts[index]);
        }
        return sc.toString() ;
    }

    /** MD5加密 */
    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (null == charsetname || "".equals(charsetname)) {
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            } else {
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
            }
        } catch (Exception e) {
        }
        return resultString;
    }

    /**
     * byte数组转16位字符串
     * @param b byte数组
     */
    public static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    /**
     * byte数组转16位字符串
     * @param b byte数组
     */
    public static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n += 256;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigIts[d1] + hexDigIts[d2];
    }

    public static void main(String[] args) {
        String s = getSalt() ;
        String pwd = "123" + s;

        System.out.println(s);

        System.out.println(MD5Encode(pwd,"utf-8"));
    }
}
